The Primary Schedule

This link is to a map that shows the primaries by date. As you can see, IA, NH, SC, NV are the only ones before 2 March 2020, aka Super Tuesday. In one day over 1/3 of the delegates will commit, including California, Texas, North Carolina, and Virginia. Delegates are apportioned, not winner take all, but those four states is almost 1/4 of everything.
2020 Democratic Presidential Nomination

Here is a link to changes in superdelegates.
Superdelegate Rule Changes for the 2020 Democratic Nomination

In a way, Democrats did a little double play here. Gave a little something to their voters, then took something back.

They did learn from the 2016 campaign season that Superdelegates can damn near nullify their voters, seeing them push Hillary past Sanders ended up becoming a black eye on the party. However they took something back... sort of... by stacking the deck on which states become the early indicator for Super Tuesday for those same Superdelegates to drop the hammer. 36% of them by the link, with another 27% on the heals of that. That is a major chunk of the Superdelegate commitment by the end of March showing that Democratic aristocracy did not go away.

I am most interested to see how they handle Harris trying to brand Biden as something sinister. And how they handle Biden, Warren, Sanders and Harris still being the arguably front four. Buttigieg being just on the outside looking in.

Overall, Independents are watching just as much as the liberal youth vote that the DNC upset back in 2016.

Did they learn, did they not? I am betting on the latter and that only benefits Trump... damnit.